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                    <a class="navbar-brand">HElib Implementing Homomorphic Encryption</a>
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<div class="title">HElib v1.0.2 Documentation </div>  </div>
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<div class="textblock"><p>HElib is an open-source (<a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License v2.0</a>) software library that implements homomorphic encryption (HE). Currently available schemes are the implementations of the <a href="http://eprint.iacr.org/2011/277">Brakerski-Gentry-Vaikuntanathan</a> (BGV) scheme and the Approximate Number scheme of <a href="http://eprint.iacr.org/2016/421">Cheon-Kim-Kim-Song</a> (CKKS), along with many optimizations to make homomorphic evaluation runs faster, focusing mostly on effective use of the Smart-Vercauteren ciphertext packing techniques and the Gentry-Halevi-Smart optimizations.</p>
<p>Articles that describe some aspects of HElib include:</p>
<ul>
<li>A (somewhat outdated) <a href="http://people.csail.mit.edu/shaih/pubs/he-library.pdf">design document</a>, Shai Halevi and Victor Shoup, April 2013.</li>
<li><a href="http://eprint.iacr.org/2014/106">Algorithms in HElib</a>, Shai Halevi and Victor Shoup, published in <a href="http://www.iacr.org/conferences/crypto2014/">CRYPTO 2014</a>.</li>
<li><a href="http://eprint.iacr.org/2014/873">Bootstrapping for HElib</a>, Shai Halevi and Victor Shoup, <a href="https://www.cosic.esat.kuleuven.be/eurocrypt_2015/">EUROCRYPT 2015</a>.</li>
</ul>
<p>Since mid-2018 HElib has been under extensive refactoring for <em>Reliability</em>, Robustness &amp; Serviceability*, <em>Performance</em>, and most importantly <em>Usability</em> for researchers and developers working on HE and its uses.</p>
<p>HElib supports an <b>"assembly language for HE"</b>, providing low-level routines (set, add, multiply, shift, etc.), sophisticated automatic noise management, improved BGV bootstrapping, multi-threading, and also support for Ptxt (plaintext) objects which mimics the functionality of Ctxt (ciphertext) objects. See <a href="https://github.com/homenc/HElib/changes.md">changes.md</a> for more details.</p>
<p>HElib is written in C++14 and uses the <a href="http://www.shoup.net/ntl/">NTL</a> mathematical library, over GMP.</p>
<p>HElib is distributed under the terms of the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License v2.0</a>. <br  />
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<p>For code downloads and full installation instructions, visit <a href="https://github.com/homenc/HElib">HElib GitHub Pages</a>. </p>
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